Tired, John? Kerry appears to be sleeping during Polish President's press conference but insists it was 'just a long blink'

John Kerry has been caught on camera closing his eyes for a possible power nap during a press conference with European leaders yesterday.

The Secretary of State was in Warsaw on Tuesday and was seated next to National Security Advisor Susan Rice as they listened to Polish President Bronislaw Komorowski speak at a news conference alongside President Obama at Belweder Palace.

News cameras captured the moment when Kerry closed his eyes, and stayed on him as they remained closed.

Keeping them closed: John Kerry's eyes were closed for at least six seconds

Keeping them open: Secretary of State John Kerry was in the audience as Polish President Bronislaw Komorowski spoke alongside President Obama on Tuesday

Kerry closed his eyes for about six seconds before reopening them and jolting up quite quickly.

Mashable editor Brian Ries spotted the moment tweeted out a GIF of the 70-year-old closing his eyes and got a quick reply from Kerry himself.

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'Just a really long blink!' Kerry wrote back via his official account.

This wouldn't be the first time that policy talk led to a little shut-eye for Kerry, though this would a seemingly unintentional instance.

Explanation: Kerry responded to a Mashable editor who shared a GIF of the moment

Listening: The moment happened while President Obama and Polish President Bronislaw Komoroski held a joint press conference in Warsaw on Tuesday afternoon

Last year he told Men's Journal that his surefire method to beat jet lag was to take an Ambien and listen to recordings of his old speeches.

'I'm out in seconds,' he told the magazine.

Kerry wasn't the only one to be caught in an off-guard moment during the trip to Warsaw as a sneaky hotel guest took unauthorized photos that purport to show President Obama pumping iron in the gym.

Kerry's presence at the Tuesday press conference was the beginning of a longer, surprising trip.

On Wednesday, he made an unannounced trip to Lebanon and arrived in Beirut this morning in an effort to show that the Obama administration supports the country as they deal with the refugee influx that came as a result of the civil war in neighboring Syria.

Wide awake: Kerry made an unannounced visit to Lebanon today after his visit to Poland